Two 5-watt Class A single-ended amps, one with reverb and one with tremolo, built into a single stereo head chassis.
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Builds: Amps

Boutique American-made amps known for retro styling, compact designs, and rich tube-driven reverb and tremolo. Hand-wired circuits, especially suited for blues and indie players.
Founder: Michael Swart
Notable players
Notable gear
Amps
View all 18 amps →The AST Head Mk II circuit in a 1x12 combo cabinet with a fully bypassable master volume and dual internal/external outputs.
The ST-6V6se circuit plus a dedicated triode spring reverb stage, still just 14 lbs, in a tweed cab with dark side panels.
The Atomic Jr's 5-watt reverb circuit in a small head format, with a switchable EQ response in place of the combo's feedback switch.
The ST-6V6se's 5-watt Class A single-ended circuit in a compact grab-and-go head chassis, for pairing with your own cabinet.
The AST circuit built for the road, with a deeper recessed-chassis cabinet, switchable external output, and a Celestion Gold Alnico speaker.
The ST-6V6se circuit stepped up into a bigger cab with a 12" speaker and footswitchable tube reverb for the hottest breakup in the single-ended Space Tone line.
The Atomic Space Tone circuit in head form, with a bypassable dedicated Master Volume tube stage and 4/8/16 ohm output switching.
A sub-20-watt EL-84 combo with a built-in attenuator and a unique post-phase-inverter master volume for dialing in breakup at any volume.